There are 19 9-letter words that start with 'extr'.
| extrabold | extracted | extractor | 
| extradite | extrality | extranets | 
| extravert | extremely | extremest | 
| extremism | extremist | extremity | 
| extricate | extrinsic | extrovert | 
| extruders | extruding | extrusion | 
| extrusive | ||
Note: These 19 9-letter words that start with 'extr' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with extra, extre, extru, extri, extro.
5-letter words start with 'extr' (1)